# QUICKI Calculator (Insulin Sensitivity)

URL: https://speedycalculator.com/calculators/health/quicki/
Last updated: 2026-10-30

> The QUICKI calculator estimates insulin sensitivity from fasting insulin and glucose with the quantitative insulin sensitivity check index. Lower values mean lower insulin sensitivity – that is, more insulin resistance.

## Inputs

- Fasting glucose (mg/dL, mmol/L)
- Fasting insulin (µU/mL)

## Results

- QUICKI
- HOMA-IR

## Formula

```
QUICKI = 1 ÷ (log₁₀ fasting insulin (µU/mL) + log₁₀ fasting glucose (mg/dL))
```

## Explanation

QUICKI was published in 2000 and correlates well with the hyperinsulinaemic-euglycaemic clamp, the gold standard test. Healthy adults usually score about 0.38–0.40; values below about 0.33 suggest insulin resistance.

### How to use the QUICKI Calculator

- **Fasting glucose**
- **Fasting insulin**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter fasting glucose and insulin from the same sample. The calculator takes the logarithms, adds them and returns the reciprocal.

### Inputs explained

FieldWhat to enterFasting glucoseUnits: mg/dL, mmol/LFasting insulinIn µU/mL

### What each result means

- **QUICKI** = 1÷(log10([Fasting insulin]) + log10([Fasting glucose]))
- **HOMA-IR** = [Fasting glucose]×[Fasting insulin]÷405

### Example values

How the main result changes when **Fasting glucose** changes and everything else stays at the example values above:

Fasting glucose (mg/dL)QUICKI450.39167.50.366900.35112.50.3381350.331800.317
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — Fasting glucose: 90 mg/dL; Fasting insulin: 8 µU/mL.

Results — **QUICKI = 0.35**; HOMA-IR = 1.78.

## Key terms

- **QUICKI**: Quantitative insulin sensitivity check index.

## FAQ

**What is a normal QUICKI?**
About 0.38 ± 0.03 in healthy adults.

**Is QUICKI better than HOMA-IR?**
They carry similar information; QUICKI behaves better statistically.

**Why use logarithms?**
Fasting insulin is very skewed, and logs make the index more linear with clamp results.


## Sources

- [Katz A et al. Quantitative insulin sensitivity check index. J Clin Endocrinol Metab, 2000](https://pubmed.ncbi.nlm.nih.gov/10902785/)